 | 1899 - 620 pages
...hair, which again began to grow after a few months. It has been computed that one person in every 800 is blind to the X-rays. That is to say, when looking through the fluoroscope, they arc utterly unable to observe the bones of the body, coins, or any other object which is clearly distinguishable... | |
 | Charles Sinclaire Elliott - 1900 - 372 pages
...fluoroscopic screen should never be permitted to re* It has been computed that one person in every 800 is blind to the x-rays. That is to say, when looking...clearly distinguishable by the ordinary observer. ceive the least particle of dust. It is on this surface that our knowledge is gathered. Dust will distort,... | |
 | R.F Mould - 1993 - 250 pages
...Colonial Druggist, March 31st 1899) it was stated that 'It has been computed that one person in every 800 is blind to the X-rays; that is to say, when looking...clearly distinguishable by the ordinary observer.' There was also a lively correspondence- on the proposal for the 'new' name radiography, which correspondent... | |
 | Irving P. Fox - 1910 - 594 pages
...be had outside of the Chinese combination. X-Ray Blind. It has been computed that one person in 800 is blind to the X-rays — that is to say, when looking...any other object which is clearly distinguishable to the ordinary observer. Start the Year Right — Advertise. By GEORGE C. ROBERTS. PHEN we observe... | |
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It has been computed that one person in every 800 is blind to the x-rays. That is to say, when looking through the fluoroscope, they are utterly unable to observe the bones of the body, coins, or any other object which is clearly distinguishable by the... 